A printed letter (the seventh) from Amans Carrier of Rodez to M. Bonafous, director of the Royal Garden at Turin, on raising silkworms and cultivating mulberry trees in the Aveyron department of France. Carrier recounts how he began silkworm rearing in Rodez in 1819 and how his cocoon yields per ounce of eggs developed. He then describes in detail his mulberry plantation on poor calcareous, stony ground near Marcillac, covering planting methods, root studies, tree spacing and pruning. The letter closes with itemized costs, projected leaf yields and returns, and plans for a magnanerie and a steam silk-reeling mill.